Short-Term Frequency Response of a DFIG-Based Wind Turbine Generator for Rapid Frequency Stabilization

Eduard Muljadi, Dejian Yang, Moses Kang, Wenzhong Gao, Junhee Hong, Jaeseok Choi, Yong Kang

Research output: Contribution to journalArticlepeer-review

6 Scopus Citations

Abstract

This paper proposes a short-term frequency-response scheme of a doubly-fed induction generator (DFIG)-based wind turbine generator (WTG) for improving rotor speed recovery and frequency nadir. In the energy-releasing period, to improve the frequency nadir and rotor speed convergence by releasing a large amount of kinetic energy stored in the rotating masses in a DFIG-based WTG, the power reference is increased up to the torque limit referred to the power and reduces along with it for a predefined period which is determined based on the occurrence time of the frequency nadir in a power grid. Then, the reference decreases so that the rotor speed is forced to be converged to the preset value in the stable operating region of the rotor speed. In the energy-absorbing period, to quickly recover the rotor speed, the reference smoothly decreases with the rotor speed and time during a predefined period until it intersects with the maximum power point tracking curve. The simulation results demonstrate that the proposed scheme successfully achieves rapid frequency stabilization with the improved frequency nadir under various wind conditions based on the IEEE 14-bus system.
Original languageAmerican English
Number of pages14
JournalEnergies
Volume10
Issue number11
DOIs
StatePublished - 2017

NREL Publication Number

  • NREL/JA-5D00-70722

Keywords

  • doubly-fed induction generator
  • frequency nadir
  • frequency stabilization
  • rotor speed convergence
  • short-term frequency response
  • torque limit

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